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Sharifi, Navid; Pugh, Martin; Moreau, Christian; Dolatabadi, Ali
Surface & coatings technology, 03/2016, Volume: 289Journal Article
In this work, atmospheric plasma spraying (APS) and suspension plasma spraying (SPS) are employed for developing micro/nano morphologies of superhydrophobic coatings with high water repellence and mobility. Accordingly, multiple coatings were developed with different surface morphologies, then by isolating the effect of surface chemistry using a stearic acid treatment, the importance and influence of the achieved morphologies on wetting behavior of the coatings were investigated. Experimental results show that, although coatings developed by the APS process may reach water contact angles as high as 145°, the water mobility of these coatings is low due to relatively large morphological features resulting from the micron-sized feedstock powder. On the other hand, coatings developed by SPS show superior water repellence (manifested through water contact angles as high as 167°) as well as improved mobility (displayed through water sliding angles as small as 1.3°) due to dual-scale submicron/nano (hierarchical) roughness attributed to the submicron size particles in the feedstock. The dynamic behavior of an impinging water droplet is studied and compared to other existing natural and fabricated superhydrophobic surfaces. Display omitted •AAPS and SPS coating techniques are employed to develop submicron-textured, hydrophobic and superhydrophobic TiO2 coatings.•APS coatings show contact angles as high as 145°, but lack the desired water mobility.•SPS coatings show superior water repellence (contact angle ~167°) and improved mobility (sliding angle as ~1.3°).•Morphology and structure of the coatings and their relationship with different wetting behavior of the coatings is studied.•Dynamic wetting of the coatings is shown to be comparable to existing natural and fabricated superhydrophobic surfaces.
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